a term of endearment used to describe a girl with a fanny so big, that intercourse resembles throwing a hotdog down a hallway.
Boyfriend: I love you, my cuntius maximus.
Girlfriend: Yeah, great.
Oversized vaginal muscles which can be used as a deterent for a penis if trained well.
"Dude there was no way in. Her cuntius maximus were jst too strong."